Fermat's Spiral

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Also called a parabolic spiral, it is a type of Archimedean Spiral. A spiral is defined as “a plane curve which runs continuously round and round, a fixed point, called the center, with constantly increasing radius vector, so that the latter is never normal to the curve; also, a part of such a curve in the course of which the radius from the center describes 360 degrees.” —Whitney, 1889




William Dwight Whitney, PhD, LLD The Century Dictionary: An Encyclopedic Lexicon of the English Language (New York, NY: The Century Co., 1895) 5839


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